ImageEn, unit iexUserInteractions

PDFium PlugIn

PDFium is a Google library providing support for Adobe PDF files. ImageEn offers the most complete Delphi implementation of PDFium.

ImageEn uses PDFium to support PDF in three ways:

1. PDF Viewer

By enabling the PdfViewer property, you can view and manipulate files in a TImageEnView. The following features are supported:

* Custom ImageEn features (not available in standard PDFium)

2. PDF Importing

When the PDFium plug-in is available ImageEn can import objects from PDF pages as vector objects that can be edited and manipulated to be saved back to PDF, SVG or other image formats.

3. Rasterized PDF Loading

When the PDFium plug-in is available ImageEn can load PDF pages in the same way as multi-frame images.
For best quality you should load the page at the intended display size using LoadFromFilePDF or by specifying the auto-scaling properties.

 PDFium support requires Delphi/BCB 7 or newer
 Download the PDFium plug-in from:
 The plug-in must be registered once by your application
 Distributions must include the copyright notices that are included with the ImageEn PDFium installation
 Specify which page to load using ImageIndex (between 0 and ImageCount-1) or use a TImageEnMView to load and display all pages
 For Windows 7 and earlier, use v5579 of the plug-in


Demo  Demos\Other\PdfViewer\PdfViewer.dpr
Demo  Demos\Other\PdfViewerToolbar\PdfViewerToolbar.dpr
Demo  Demos\Actions\Actions_PdfViewer\PdfViewerActions.dpr
Demo  Demos\Other\PdfPrinter\PdfPrinter.dpr


// Register the PDFium Plug-In
IEGlobalSettings().RegisterPlugIns([ iepiPDFium ]);

// Display a PDF document (and allow text and image selection, scaled viewing, etc)
ImageEnView1.PdfViewer.Enabled := True;
ImageEnView1.MouseInteractGeneral := [ miPdfSelectText, miPdfSelectRgn ];
ImageEnView1.IO.LoadFromFilePDF( 'C:\document.pdf' );

// Display a PDF document and image selection (no text selection)
ImageEnView1.PdfViewer.Enabled := True;
ImageEnView1.MouseInteractGeneral := [ miPdfSelectRgn ];
ImageEnView1.IO.LoadFromFilePDF( 'C:\document.pdf' );

// Display a PDF document and allow editing of the page objects
ImageEnView1.PdfViewer.Enabled := True;
ImageEnView1.PdfViewer.AllowObjectEditing := True;
ImageEnView1.MouseInteractGeneral := [ miPdfSelectObject ];
ImageEnView1.IO.LoadFromFilePDF( 'C:\document.pdf' );

// Display a PDF page (as an image)
ImageEnView1.PdfViewer.Enabled := False;      // Default is false anyway
ImageEnView1.IO.LoadFromFilePDF( 'C:\document.pdf' );

// Display third page of a PDF document
ImageEnView1.IO.Params.ImageIndex := 2;
ImageEnView1.IO.LoadFromFilePDF( 'C:\document.pdf' );

// Enable form editing
ImageEnView1.PdfViewer.Enabled := True;
ImageEnView1.PdfViewer.AllowFormEditing := True;
ImageEnView1.IO.LoadFromFilePDF( 'C:\document.pdf' );

// Display all pages of a PDF in a TImageEnMView
ImageEnMView1.MIO.LoadFromFilePDF( 'C:\document.pdf' );

// Show thumbnail preview of all pages of a PDF document
ImageEnView1.PdfViewer.Enabled := True;
ImageEnMView1.AttachedImageEnView := ImageEnView1;
ImageEnView1.IO.LoadFromFilePDF( 'C:\document.pdf' );

// Convert a multi-page PDF file to TIFF
// Ensure iepdf32.dll is in the EXE folder
mbmp := TIEMultiBitmap.Create( 'D:\multi.pdf' );
mbmp.Params[0].TIFF_Compression := ioTIFF_LZW;
mbmp.Write( 'D:\Converted.TIFF' );

// Save all pages of a PDF file to PNG
filename := 'C:\doc.pdf';
outputFolder := 'D:\';
IEGlobalSettings().PdfViewerDefaults.DPI := 144; // PDF files are 72 DPI, so 144 is 200% size
bmp := TIEBitmap.Create;
bmp.ParamsEnabled := True;
idx := 0;
  bmp.Params.ImageIndex := idx;
  bmp.Read( filename );
  bmp.Write( IncludeTrailingBackSlash( outputFolder ) + format( '%s_%d.png', [ ExtractFilename( filename ), idx+1 ] ));
  inc( idx );
Until idx > bmp.Params.ImageCount - 1;

See Also